Question 7 1 pts What is a binary variable? O A variable that is not well-defined O A variable that can take on only two values A variable that can take on only positive values O A variable that can take on any valueQuestion 8 1 pts If a health plan analyst wanted to determine if the readmissions rates for two hospitals were statistically different, what is the null hypothesis? O The readmission rate for one hospital is smaller than the other O The readmission rate for one hospital is larger than the other O The readmission rates are equal O The readmission rates are not equalQuestion 9 1 pts Which test statistic should be used to test the hypothesis that there is an association between patient gender and readmission rate? O One-sample z-test for proportions O Two-sample z-test for proportions O Chi-square test O T-testQuestion 10 1 pts You are conducting a one-sample t-test; the sample contains 30 observations. The number of degrees of freedom for the one-sample t-test is: O 31 O 28 O 29 O 30Question 11 1 pts Which of the following variables is nominal? Patient gender Length of stay O Severity level O AgeQuestion 12 1 pts The average charge for Dr. Spendy's patients is $10,034, and the average charge for Dr. Saver's patients is $6,158. A test was conducted to determine if the average charge for the patients of these two physicians was significantly different. The calculated value of the test statistic is 3.144 and the critical value of the test statistic is 2.021. In this case: O not enough information provided O conduct the test again because the results are inconclusive O fail to reject the null hypothesis. O reject the null hypothesis